Sean Grieshop competes in the finals of the men's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Sean Grieshop competes in the finals of the men's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Katie Ledecky competes in the finals of the women's 800 meter freestyle on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Katie Ledecky competes in the finals of the women's 800 meter freestyle on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Chase Kalisz competes in the finals of the men's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Chase Kalisz competes in the finals of the men's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Bradlee Ashby competes in the finals of the men's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Bradlee Ashby competes in the finals of the men's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Michael Weiss competes in the finals of the men's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Michael Weiss competes in the finals of the men's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Taylor Ruck competes in the finals of the women's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Taylor Ruck competes in the finals of the women's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Madisyn Cox competes in the finals of the women's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Madisyn Cox competes in the finals of the women's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Mary-Sophie Harvey competes in the finals of the women's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Mary-Sophie Harvey competes in the finals of the women's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Hannah Cox (back) talks with Zoe Bartel after competing in the finals of the women's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Hannah Cox (back) talks with Zoe Bartel after competing in the finals of the women's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Patrick Park competes in the heat C final of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Patrick Park competes in the heat C final of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Destiny Kling prepares to compete in the heat D finals of the women's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Destiny Kling prepares to compete in the heat D finals of the women's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Tanner Olson competes in the finals of the men's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Tanner Olson competes in the finals of the men's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Simone Manuel competes in the finals of the women's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Simone Manuel competes in the finals of the women's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Kevin Cordes competes in the finals of the men's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Kevin Cordes competes in the finals of the men's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Breeja Larson competes in the finals of the women's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Breeja Larson competes in the finals of the women's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Brad Craig competes in the finals of the men's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Brad Craig competes in the finals of the men's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Adil Assouab competes in the finals of the men's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Adil Assouab competes in the finals of the men's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Ari-Pekka Liukkonen competes in the finals of the men's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Ari-Pekka Liukkonen competes in the finals of the men's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Katie Ledecky signs autographs on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Katie Ledecky signs autographs on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Destiny Kling competes in the heat D finals of the women's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Destiny Kling competes in the heat D finals of the women's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Kelsi Worrell competes in the preliminary heat of the women's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Kelsi Worrell competes in the preliminary heat of the women's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

MESA, AZ - APRIL 15: Tom Shields competes in the preliminary heat of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images) Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

MESA, AZ - APRIL 15: Tom Shields competes in the preliminary heat of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images)
Chris Coduto, Getty Images

MESA, AZ - APRIL 15: Hector Ruvalcaba Cruz competes in the preliminary heat of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images) Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

MESA, AZ - APRIL 15: Hector Ruvalcaba Cruz competes in the preliminary heat of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images)
Chris Coduto, Getty Images

MESA, AZ - APRIL 15: Zach Harting competes in the preliminary heat of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images) Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

MESA, AZ - APRIL 15: Zach Harting competes in the preliminary heat of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images)
Chris Coduto, Getty Images

MESA, AZ - APRIL 15: Tom Shields competes in the preliminary heat of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images) Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

MESA, AZ - APRIL 15: Tom Shields competes in the preliminary heat of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images)
Chris Coduto, Getty Images

MESA, AZ - APRIL 15: Hector Ruvalcaba Cruz competes in the preliminary heat of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images) Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

MESA, AZ - APRIL 15: Hector Ruvalcaba Cruz competes in the preliminary heat of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images)
Chris Coduto, Getty Images

MESA, AZ - APRIL 15: Ella Eastin competes in the preliminary heat of the women's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images) Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

MESA, AZ - APRIL 15: Ella Eastin competes in the preliminary heat of the women's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images)
Chris Coduto, Getty Images

MESA, AZ - APRIL 15: Kelsi Worrell competes in the preliminary heat of the women's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images) Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

MESA, AZ - APRIL 15: Kelsi Worrell competes in the preliminary heat of the women's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images)
Chris Coduto, Getty Images

MESA, AZ - APRIL 15: Simone Manuel competes in the preliminary heat of the women's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images) Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

MESA, AZ - APRIL 15: Simone Manuel competes in the preliminary heat of the women's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images)
Chris Coduto, Getty Images

MESA, AZ - APRIL 15: Mie Nielsen competes in the preliminary heat of the women's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images) Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

MESA, AZ - APRIL 15: Mie Nielsen competes in the preliminary heat of the women's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images)
Chris Coduto, Getty Images

MESA, AZ - APRIL 15: Simone Manuel competes in the preliminary heat of the women's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images) Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

MESA, AZ - APRIL 15: Simone Manuel competes in the preliminary heat of the women's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images)
Chris Coduto, Getty Images

MESA, AZ - APRIL 15: Lauren Savoy competes in the preliminary heat of the women's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images) Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

MESA, AZ - APRIL 15: Lauren Savoy competes in the preliminary heat of the women's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images)
Chris Coduto, Getty Images

MESA, AZ - APRIL 15: Lauren Case competes in the preliminary heat of the women's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images) Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

MESA, AZ - APRIL 15: Lauren Case competes in the preliminary heat of the women's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. (Photo by Chris Coduto/Getty Images)
Chris Coduto, Getty Images

Hannah Saiz competes in the preliminary heat of the women's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Hannah Saiz competes in the preliminary heat of the women's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Chase Kalisz competes in the preliminary heat of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Chase Kalisz competes in the preliminary heat of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Breeja Larson competes in the preliminary heat of the women's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Breeja Larson competes in the preliminary heat of the women's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Zach Harting competes in the preliminary heat of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Zach Harting competes in the preliminary heat of the men's 200 meter butterfly on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Katie Meili competes in the preliminary heat of the women's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Katie Meili competes in the preliminary heat of the women's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Chiara Ruiu competes in the preliminary heat of the women's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Chiara Ruiu competes in the preliminary heat of the women's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Mallory Korenwinder competes in the preliminary heat of the women's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Mallory Korenwinder competes in the preliminary heat of the women's 100 meter breaststroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Matt Grevers competes in the preliminary heat of the men's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Matt Grevers competes in the preliminary heat of the men's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Katie Ledecky competes in the preliminary heat of the women's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Katie Ledecky competes in the preliminary heat of the women's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Michael Andrew competes in the preliminary heat of the men's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Michael Andrew competes in the preliminary heat of the men's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Michael Weiss reacts after competing in the preliminary heat of the men's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Michael Weiss reacts after competing in the preliminary heat of the men's 200 meter individual medley on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Arkady Vyatchanin competes in the finals of the men's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Arkady Vyatchanin competes in the finals of the men's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Simone Manuel competes in the finals of the women's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona. Chris Coduto, Getty Images

Mesa Arena Pro Swim Series 2017

Simone Manuel competes in the finals of the women's 100 meter backstroke on day three of the Arena Pro Swim Series - Mesa at Skyline Aquatic Center on April 15, 2017 in Mesa, Arizona.
Chris Coduto, Getty Images

Amanda Kendall (lane 8) dives into the pool during the Women 50 Meter Freestyle final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Amanda Kendall (lane 8) dives into the pool during the Women 50 Meter Freestyle final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Chase Kalisz wins the Men 400 Meter Individual Medley final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Chase Kalisz wins the Men 400 Meter Individual Medley final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Chase Kalisz wins the Men 400 Meter Individual Medley final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Chase Kalisz wins the Men 400 Meter Individual Medley final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Chase Kalisz wins the Men 400 Meter Individual Medley final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Chase Kalisz wins the Men 400 Meter Individual Medley final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Chase Kalisz wins the Men 400 Meter Individual Medley final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Chase Kalisz wins the Men 400 Meter Individual Medley final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Arizona State swimming coach Bob Bowman holds Boomer Phelps, the son of Michael Phelps as they cheer-on Chase Kalisz to victory in the Men 400 Meter Individual Medley final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Arizona State swimming coach Bob Bowman holds Boomer Phelps, the son of Michael Phelps as they cheer-on Chase Kalisz to victory in the Men 400 Meter Individual Medley final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Arizona State swimming coach Bob Bowman holds Boomer Phelps, the son of Michael Phelps as they cheer-on Chase Kalisz to victory in the Men 400 Meter Individual Medley final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Arizona State swimming coach Bob Bowman holds Boomer Phelps, the son of Michael Phelps as they cheer-on Chase Kalisz to victory in the Men 400 Meter Individual Medley final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Jacob Pebley jumps into the pool and goes on to win the Men 200 Meter Backstroke final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Jacob Pebley jumps into the pool and goes on to win the Men 200 Meter Backstroke final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Jacob Pebley wins the Men 200 Meter Backstroke final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Jacob Pebley wins the Men 200 Meter Backstroke final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Jacob Pebley wins the Men 200 Meter Backstroke final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Jacob Pebley wins the Men 200 Meter Backstroke final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Jacob Pebley wins the Men 200 Meter Backstroke final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Jacob Pebley wins the Men 200 Meter Backstroke final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Jacob Pebley wins the Men 200 Meter Backstroke final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Jacob Pebley wins the Men 200 Meter Backstroke final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Ari-Pekka Liukkonen (center) wins the Men 50 Meter Freestyle final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Ari-Pekka Liukkonen (center) wins the Men 50 Meter Freestyle final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Nathan Adrian finishes second in the Men 50 Meter Freestyle final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Nathan Adrian finishes second in the Men 50 Meter Freestyle final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Ari-Pekka Liukkonen wins the Men 50 Meter Freestyle final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Ari-Pekka Liukkonen wins the Men 50 Meter Freestyle final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Ari-Pekka Liukkonen wins the Men 50 Meter Freestyle final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Ari-Pekka Liukkonen wins the Men 50 Meter Freestyle final during the Arena Pro Swim Series Mesa on Friday, April 14, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Nathan Adrian prepares to race in the Mens 100 LC Meter Freestyle final during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Nathan Adrian prepares to race in the Mens 100 LC Meter Freestyle final during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Joao De Lucca and Nathan Adrian (back) in the Mens 100 LC Meter Freestyle final during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz. Nathan Adrian won the race. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Joao De Lucca and Nathan Adrian (back) in the Mens 100 LC Meter Freestyle final during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz. Nathan Adrian won the race.
Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Tom Shields prepares for his race in the Men 100 LC Meter Butterfly final during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Tom Shields prepares for his race in the Men 100 LC Meter Butterfly final during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Tom Shields wins the Men 100 LC Meter Butterfly final during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Tom Shields wins the Men 100 LC Meter Butterfly final during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Sierra Schmidt dances behind the block before the Women 400 LC Meter Freestyle final during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Sierra Schmidt dances behind the block before the Women 400 LC Meter Freestyle final during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Marcelo Acosta wins the Men 400 LC Meter Freestyle final in 3:53.38 during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Marcelo Acosta wins the Men 400 LC Meter Freestyle final in 3:53.38 during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Marcelo Acosta wins the Men 400 LC Meter Freestyle final in 3:53.38 during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Marcelo Acosta wins the Men 400 LC Meter Freestyle final in 3:53.38 during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Marcelo Acosta wins the Men 400 LC Meter Freestyle final in 3:53.38 during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Marcelo Acosta wins the Men 400 LC Meter Freestyle final in 3:53.38 during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

Marcelo Acosta wins the Men 400 LC Meter Freestyle final in 3:53.38 during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz. Rob Schumacher/azcentral sports

Mesa Arena Pro Swim Series 2017

Marcelo Acosta wins the Men 400 LC Meter Freestyle final in 3:53.38 during the Arena Pro Swim Series Mesa on Thursday, April 13, 2017 at Skyline Aquatic Center in Mesa, Ariz.
Rob Schumacher/azcentral sports

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Eight-time Olympic medalist Allison Schmitt is returning to competitive swimming for the first time since the 2016 Rio Olympics at the TYR Pro Series meet in Mesa.(Photo: Rob Schumacher/Arizona Republic)

When Schmitt returned returned to the pool last fall, three times a week at first, Bowman knew soon enough the three-time Olympian had more than her stated objective of getting back into shape in mind.

"It was her persistence coming back and swimming on a regular basis," said the Arizona State coach, who has coached Schmitt since 2007. "It was more than just a stay-in-shape kind of attitude."

Schmitt said Bowman "could see the excitement I was having and fun." Her attitude was the reverse of 2016 when she was counting down the days to her last practice before the Rio Olympics along with training partner Michael Phelps.

"I had no intention of swimming again or coming back," Schmitt said. "It just kind of happened."

She first joked about making a run at the 2020 Tokyo Olympics, but as the weekly practices increased, so did her serious thought about the idea.

"It did surprise me, but then again it didn't," Bowman said. "She never would sign her retirement paper," to be removed from the elite athlete drug testing program. "After several months, I thought maybe she was doing that for a reason."

Early this year, when Schmitt began doing two-a-day workouts, a plan was in place for her to return to competition. That will happen this week at the TYR Pro Swim Series meet in Mesa. Schmitt will swim in the 200-meter freestyle Thursday and 100 free Friday, looking for a new starting point at age 27.

"It's going to be a long road," said Bowman, whose is not putting any big expectations on the Mesa meet. "She's done some good things in practice and gotten in pretty good condition. She is physically capable, if she can get back to her (prior) training level. I'm confident she could do pretty well."

Schmitt has won eight Olympic medals, tied for fourth most among American women swimmers. Four are gold, including in the 200 free in 2012, when she set the still-standing American record (1:53.61).

Since the Rio Games, where she was a two-time relay medalist, Schmitt enrolled at ASU and is a year into obtaining a master's degree in social work. Her plan is to become a counselor specifically for athletes.

"Mental health is Number 1, but my passion for swimming is still there," Schmitt said. "I'm doing it for the right reasons for myself."

Those close to her have pressed Schmitt on the risk of her comeback falling short of a fourth Olympics.

"It's definitely worth it no matter what happens," she said. "I'm enjoying the journey right now, that's the most important part. I could stop tomorrow or a month from now and still be happy with where I am."

Not training with now-retired Phelps will be a different experience. But Schmitt lives with Phelps, his wife and their two young sons in Scottsdale, so her quasi-brother still is around for advice and support.

"They know me so well and they're able to read all my actions like they are written across my forehead," Schmitt said. "They're able to see right through me. I wouldn't be swimming without their encouragement."

Meet format changes

The sixth pro series meet in Mesa includes almost almost 40 percent of the 2017-18 USA Swimming men's national team and 30 percent of the women's team.

Katie Ledecky, though, is absent for the first time coming off her second and final season at Stanford. The six-time Olympic medalist recently turned pro and plans to continue training at Stanford toward the Tokyo Olympics.

Mesa is the third of six TYR Pro Series stops and the first outdoors.

There are some format changes including 50-meter events for each stroke culminating in a shootout final, additions of the 800 free for men and 1,500 free for women and creation of a mixed 400 medley relay and 200 individual medley final with stroke order determined prior to the event.

Chase Kalisz is the men's series points leader and will be in Mesa. The women's points leader is 17-year-old Taylor Ruck of Scottsdale, who will be absent after winning a record-tying eight medals for Canada at the Commonwealth Games in Australia.